# Scrapy settings for amazon project
#
# For simplicity, this file contains only settings considered important or
# commonly used. You can find more settings consulting the documentation:
#
#     https://docs.scrapy.org/en/latest/topics/settings.html
#     https://docs.scrapy.org/en/latest/topics/downloader-middleware.html
#     https://docs.scrapy.org/en/latest/topics/spider-middleware.html

BOT_NAME = "amazon"

SPIDER_MODULES = ["amazon.spiders"]
NEWSPIDER_MODULE = "amazon.spiders"

# Crawl responsibly by identifying yourself (and your website) on the user-agent
# USER_AGENT = "amazon (+http://www.yourdomain.com)"

# Obey robots.txt rules
ROBOTSTXT_OBEY = False

# Configure maximum concurrent requests performed by Scrapy (default: 16)
# CONCURRENT_REQUESTS = 32

# Configure a delay for requests for the same website (default: 0)
# See https://docs.scrapy.org/en/latest/topics/settings.html#download-delay
# See also autothrottle settings and docs
# DOWNLOAD_DELAY = 3
# The download delay setting will honor only one of:
# CONCURRENT_REQUESTS_PER_DOMAIN = 32
# CONCURRENT_REQUESTS_PER_IP = 32

# Disable cookies (enabled by default)
# COOKIES_ENABLED = False

# Disable Telnet Console (enabled by default)
# TELNETCONSOLE_ENABLED = False

# Override the default request headers:
# DEFAULT_REQUEST_HEADERS = {
#    "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
#    "Accept-Language": "en",
# }

# Enable or disable spider middlewares
# See https://docs.scrapy.org/en/latest/topics/spider-middleware.html
# SPIDER_MIDDLEWARES = {
#    "amazon.middlewares.AmazonSpiderMiddleware": 543,
# }

# Enable or disable downloader middlewares
# See https://docs.scrapy.org/en/latest/topics/downloader-middleware.html
DOWNLOADER_MIDDLEWARES = {
    "amazon.middlewares.AmazonDownloaderMiddleware": 543,
    'scrapy.downloadermiddlewares.retry.RetryMiddleware': None,  # 禁用默认的重试中间件
    "amazon.middlewares.MyRetryDownloaderMiddleware": 544,

}

# Enable or disable extensions
# See https://docs.scrapy.org/en/latest/topics/extensions.html
# EXTENSIONS = {
#    "scrapy.extensions.telnet.TelnetConsole": None,
# }

# Configure item pipelines
# See https://docs.scrapy.org/en/latest/topics/item-pipeline.html
ITEM_PIPELINES = {
    "amazon.pipelines.AmazonMysqlPipeline": 300,
}

# Enable and configure the AutoThrottle extension (disabled by default)
# See https://docs.scrapy.org/en/latest/topics/autothrottle.html
# AUTOTHROTTLE_ENABLED = True
# The initial download delay
# AUTOTHROTTLE_START_DELAY = 5
# The maximum download delay to be set in case of high latencies
# AUTOTHROTTLE_MAX_DELAY = 60
# The average number of requests Scrapy should be sending in parallel to
# each remote server
# AUTOTHROTTLE_TARGET_CONCURRENCY = 1.0
# Enable showing throttling stats for every response received:
# AUTOTHROTTLE_DEBUG = False

# Enable and configure HTTP caching (disabled by default)
# See https://docs.scrapy.org/en/latest/topics/downloader-middleware.html#httpcache-middleware-settings
# HTTPCACHE_ENABLED = True
# HTTPCACHE_EXPIRATION_SECS = 0
# HTTPCACHE_DIR = "httpcache"
# HTTPCACHE_IGNORE_HTTP_CODES = []
# HTTPCACHE_STORAGE = "scrapy.extensions.httpcache.FilesystemCacheStorage"

# Set settings whose default value is deprecated to a future-proof value
TWISTED_REACTOR = "twisted.internet.asyncioreactor.AsyncioSelectorReactor"
FEED_EXPORT_ENCODING = "utf-8"

# 日志保存并设置日志保存等级
# LOG_LEVEL = 'DEBUG'
# LOG_FILE = './log.txt'

# 请求延迟
DOWNLOAD_DELAY = 2
RETRY_DELAY = 2

RETRY_EXCEPTIONS = [
    'twisted.internet.defer.TimeoutError', # 超时重试
    'twisted.internet.error.TimeoutError',
    'twisted.internet.error.DNSLookupError',
    'twisted.internet.error.ConnectionRefusedError',
    'twisted.internet.error.ConnectionDone',
    # 'twisted.internet.error.ConnectError',# 超时重试
    'twisted.internet.error.ConnectionLost',
    'twisted.internet.error.TCPTimedOutError',
    'twisted.web.client.ResponseFailed',
    IOError,
    'scrapy.core.downloader.handlers.http11.TunnelError',
]

RETRY_HTTP_CODES = [
    500,
    502,
    # 503,
    504,
    522,
    524,
    408,
    429,
    400
]
